This source refers to the slashes:
"Cadastral Surveying in Colonial South Carolina: a Historical Geography"
by Linda Marie Pett-Conklin, p. 99. This is apparently a PHD thesis from
LSU, 1986; I saw a copy at the DAR Library ("Published" by UMI
Dissertation Services, Ann Arbor, MI).
She has a reference which I have not followed up on: "Mapping of the
Southeast: the First Two Centuries," THE SOUTHEASTERN GEOGRAPHER, Vol.
VI (1966), 3-19.
I would like to hear some thoughts and ideas on this question....
I am working with some SC plats for the original colonial and state land
grants. A 1758 plat shows a road (now a federal highway) and the same road
is shown on a 1789 plat. On a plat surveyed in 1787 that I think fits
between the previously mentioned plats, there is no road indicated. How
much significance should I give to the fact that the road is not indicated
on the 1787 plat....the plat shapes and adjacent neighbors seem to match up
fairly well and fit within a larger cluster of plats that I have located.